diff --git a/docs/oidc-client-ts.api.md b/docs/oidc-client-ts.api.md
index 150e770c3..d09915984 100644
--- a/docs/oidc-client-ts.api.md
+++ b/docs/oidc-client-ts.api.md
@@ -218,7 +218,7 @@ export class Logger {
     // (undocumented)
     static info(name: string, ...args: unknown[]): void;
     // (undocumented)
-    throw(err: unknown): never;
+    throw(err: Error): never;
     // (undocumented)
     warn(...args: unknown[]): void;
     // (undocumented)
diff --git a/src/SessionMonitor.ts b/src/SessionMonitor.ts
index f513754e9..53f288a8a 100644
--- a/src/SessionMonitor.ts
+++ b/src/SessionMonitor.ts
@@ -18,7 +18,7 @@ export class SessionMonitor {
 
     public constructor(private readonly _userManager: UserManager) {
         if (!_userManager) {
-            this._logger.throw("No user manager passed to SessionMonitor");
+            this._logger.throw(new Error("No user manager passed"));
         }
 
         this._userManager.events.addUserLoaded(this._start);
diff --git a/src/utils/Logger.ts b/src/utils/Logger.ts
index c28364fd3..a64d325a5 100644
--- a/src/utils/Logger.ts
+++ b/src/utils/Logger.ts
@@ -89,7 +89,7 @@ export class Logger {
         }
     }
 
-    public throw(err: unknown): never {
+    public throw(err: Error): never {
         this.error(err);
         throw err;
     }